olymmath

JBMO 2017 Problem 3

  • Paper

Let ABCA B C be an acute triangle such that AB≠ACA B \neq A C, with circumcircle Γ\Gamma and circumcenter OO. Let MM be the midpoint of BCB C and DD be a point on Γ\Gamma such that AD⊥BCA D \perp B C. Let TT be a point such that BDCTB D C T is a parallelogram and QQ a point on the same side of BCB C as AA such that

∠BQM=∠BCA and ∠CQM=∠CBA\angle B Q M=\angle B C A \text { and } \angle C Q M=\angle C B A

Let the line AOA O intersect Γ\Gamma at E,(E≠A)E,(E \neq A) and let the circumcircle of △ETQ\triangle E T Q intersect Γ\Gamma at point X≠EX \neq E. Prove that the points A,MA, M, and XX are collinear.

Dataset text NuminaMath olympiads. Quoted with source.

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